Knee support



FIG. 1 is a front view of a knee support showing my new design;

FIG. 2 is a front right perspective view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear right perspective view thereof;

FIG. 5 is a rear left perspective view thereof; and,

FIG. 6 is a front left perspective view thereof.

The cross hatching utilized in the drawings indicates a contrasting appearance. 

CLAIM The ornamental design for a knee support, as shown and described. 